Lathe grinding device



Nov. 2, 1948. .1. B.- KOETT 2,453,020 I LATHE GRINDING DEVICE FiledMarch 4, 1946 4 Sheets-Sheet 1 39 3849 73 1/ u I T 86 ll u I 37 i m 87 74o 36 I9 53 43 i E 50 us Nov. 2, 1948. J; B. KQETT 2,453,020

LATHE GRINDING DEVICE Filed March 4, 1946 Nov. 2, 1948. J. a. KOETT2,453,020

LATHE GRINDING DEVICE Filed March 4, 1946 4 Sheets-Sheet 4 mounted uponthe bracket, designated l4, having bearing ends i5 and I6 respectivelyand being formed between same with a longitudinal chamber ll, dovetailedout for the reception of the dovetail portion I8 of a dovetail slide I9.

There is a dial plate 25, which is a part of the slide 24 and this dialplate overlies the dovetail slide "or carriage I9. The'slide I9 isformed with an annular track or groove 22 which opens out of the face ofslide l9 by means of an annular concentric counterrace 23, this trackbeing also formed concentrically of a cylindrical collar with whichslide I9 is provided as a means for centering the cylindrical socketorcounterseat 29 formed in the dial plate 25 of slide H4. The latter isformed with a dovetail part 26, holes 28a flankprojecting beyond itsthreaded portion upon which the elongated pulley 53 is secured. At itsopposite end the quill is formed with a flange 66 in advance of which isa terminal socket portion 81. A conical socket 58 is formed so as toopen out of the internal bore 69 of the quill, so as to flare outwardlyof its tool receiving end. There is a draw "bar "or tie rod lll whichextends longitudinally in the boreBS of the quill. It is formed at oneend with a threaded portion H and at its other remote end with anintegral head 12. It is eming the same. Diametrically opposite holes 21are also formed upon the dial plate 25as shown in.

Figure 13. Extending longitudinally centrally in the slide 24 is a bore30'which is screw threaded at *one'end 'as -shown in Figure 13:

bearing housing or tool holder 3! is provided whil-iis for-med upon ablock 32 formed with a dovetail recess 33. The dovetailed part 26 ofslide 2'4 is-chambered out as at 28. For the purpose of supporting anelectric motor 42 oppositely =a'r'rangedbrackets 34 and- 35 areprovided, which straddle the carriage I!) at opposite ends.

Each bracket has a triangular slot 36. The ends of a stout rod orpintle3-lpass into the upper corners ofthe brackets 34, 35 and connect themtogether I in front of the bracket in suitable washers 38 being mountedupon this rod which also abut the yoke 4! which are fulcrumed upon rod31. The electric motor 42 is rigidly secured with a convex'surfacethereof accommodated in the arcuate ployed for certain types of toolswhich it is desired to mount in the tool holder 3i. One such tool isillustrated in Figure 4. Here there is disclosed a spindle '53 formedshort of one end thereof with an annular shoulder or flange M from whichprojects as one terminal of the tool a reduced pintle 15 which isinternally formed with a screw threaded socket 16. At the opposite endof this tool is a conical shank H which tapers towards the adjacent end,whichend is formed with an internal screw threaded passage 18. A grinderdisk is designated 19. It is'mounted upon the pintle l5 of'the tool inquestion so as to abut with oneside against the flange 14 of thespindle, after which a washer 80 is slipped onto the pintle soas --toabut the other side of the grinding disk, and

brackets, and abuttingly engaging these washers are the inner ends ofarms 39 and 40 of a lever surface of theyoke 4|, fasteners 44 securingthe motor to this yoke. The motor carries bearings 43 at oppositeendsthereof. As a means of holding themotor elevated with respect to thebracket 1G and slide l9, I'employ a brace arm 45 of rigid constructionshown in Figures 1 and 3.,

' in the circumference of the motor 42, by passing a screw 41 throughits other end and also in any one of the series of ears 41a formed onthe motor which has holes 47b inthem to accommodate said screw." Theother end of the brace arm is slotted,"

as at 48, so a locking screw 49 may pass therethrough and be tappedremovably into the adjawhich, as shown in Figure 7, is of convexexterior Mounted upon the motorshaft 54 is a pulley 5| surfacepreferably. This pulley is splined as at 56 into the'motor shaft 54, andheld against endwise displacement from the shaft by meansof a washer 51'held in place around the shaft by a screw 58.

There is a mandrel pulley 53 attached to the end of a'quill 63 about tobe described. This is an elongated pulleywhich is removably attached tothe end 65 of the quill by screws 83, and is formed *Abelt is trainedupon pulleys 53 and 5|, designated threa'dedcas' at 64; and there is areduced stem 65 E5 of the quill.

then a screw 82 is taken and screwed home into the screw threadedpassage or socket 16 of the spindle to hold the disk against endwisedisplacement'from the spindle.

.The elongated pulley 53 is formed with screw holes 83 in which machinescrews 84 are tapped so asto bind this pulley fast upon the reduced stemSleeve 62 is formed with a flange 85 which extends snugly into anannular chamber 89 formed in a dust cap 86, there being two dustcapsfone at eachend oi the tool holder 3|, the other dust cap beingdesignated 81. Chamber 89 is formed in the flange or collar 3930f the.dust cap. Each dust cap has its screw threaded collar 88threaded-intoone end of the tool holder 3!,

-- and through a central opening therein, 88a, pro- 'jects'thestem otthequill.

This brace arm is attachable at varying points A washer 9! is employedto fit into the chamber 92, Fig. 7, ofthe pulley 53, and a screw 93 'istapped into the washer and into the adjacent end of the quill. It willbe seen from Figure 12 that the flange 65 of the quill is'of a diameterlarger than the sleeve 62, so the sleeve abuts at one end against thisflange which arrangement holds this end of the quill in centeredposition in the tool holder, while the flange of the sleeve bearingagainst the dust cap 81 receives endwise thrust of the flange of thequill upon this'sleeve,

' while the same quill flange is rotatively received in the chamber 92of the other dust cap 86.

The bracket part H, which is upstanding or upright receives in itshollowed-out portion 13a, 60'

screw rod 94, the screw threads of which are designated 94a. This screwrod has areduced'portion or terminal 95 which is screw threaded as shownin Figurev 10, so'that a nut Q6 may clamp this terminal in" abuttingrelation to' oneof the bearings I5, at each end of thehollowed-outportion 13. A nut 91 is screwed onto the screw rod 94fl'andis designed to travel in the'chamber l3'longitud nally thereof. Thescrew rod 94 slidably projects outbf the dovetailed portion l 8 of thebracket and. is encased'in a tubular spacer member 98, conical in crosss'ectionwvhichhasit's inner tapering end op'eratively positioned intothis dovetailedportion. *A'collar dial I00 also encircles rod 94 andabuts the-adjacent end of. the spacer member 98. The rod 94' terminatesthe hand-wheel "in position and against displace-'51s mentsfrom thespacer member 93. Threadably d; is threaded into ne bore 3.scylindrical;,ipollar 2Qof thQmdQViQtafl slide U shown in Figure v,This screw is threaded into the screw threaded bo're -I*I+-=oft'he nutas shown in Figure 13. I a 1 rilherenisi ,anoth ranutzi 158i:.whi haisnsr w .i'lthr eded un n. a. screw. rodalilfii wh c longitudinally into thebores 30 formed in the ends of the graduated dovetail slide 2 as shownin Figure 13, such that the inner end of this screw rod Ii 0 isrotatably mounted in the adjacent bore 30 to hold rod I 59 againstendwise movement. A screw la is threaded into nut I03 and also intoLTheparteI 0 ofltheibrachet willnbe-aemovably at- .ztachedartowhateverrmachine tit, :isai-esirednineaccordancewwith #:th kind) of:iobiit, :isnintendedeto work. at'szrattachingetriboltsupassingflthroughiszthe 1 holes ;I Zrthereof.

nwhateverthe tQQltHlOllIltGddlDOIltthE toolhclder 3 l ritzmav:be-gcausedzto-perform itfifWQTkliiflWfil'ilGUS 1 angular;and-gradiahpositionsiwitlrtmsnectato fixedly r attached: rbracket.Thenoperatomaakes 'wheel n03?:fiorrthe:purposepofr notattng screwarodriage they move in unison with the carriage slide block 32 of the toolholder 3!, as shown in Figure 10. There is a gib or wear plate H2located in the dovetail groove in which the dovetail part,

26 of the dovetail slide 2 3 works, and it is pressed adjustably againstthe dovetail part 26 by the adin position upon the screw rod I09. As ameans of attaching the dial plate 25 of the dovetail slide 24swivellably of the carriage i9 T-shaped bolts II'I may be made use of asshown in Figure 11. Here there is shown the manner of attachment. TheT-bolts have their threaded shanks projecting through the holes 2'! ofthe dial plate 25 (Figure 13). The heads H9 of these bolts areintroduced into the open ends 2% (Figure 9) of the annular track 22formed in carriage I 9. With the shanks of the bolts accommodated in thecounterrace 23 thereof, The clamping nuts I 26 may then be tightenedagainst the dial plate 25 which they abut to lock the dovetail 2c inposition with respect to the carriage E9.

The operation of my invention is as follows.

According to the nature of the machine shop work it is proposed to do,the proper tool will be placed in the tool holder 3| and centeredtherein for ro-- tation, If the tool shown in Figure 4 is employed tomount a grinder wheel or disk I9 upon the tool holder, the procedure isas follows: In Figure 12 it is seen that the tapering shank ll of thespindle "i3 has a screw threaded bore I8 into which the screw threadedend I I' of the tie rod I0 is threaded tightly so as to seat the taperedshank 'II snugly into the conically tapered socket 68 of the quill, thescrewing home of the tie bolt causing its head IL to be clampedabuttingly against the adjacent end of the quill This rigidly centersthe spindle in the tool holder, The grinder wheel is then clampedbetween flange M of the quill and washer BI on its terminal pintle 15 bythe screw 82. This mounts the grinder wheel firmly in position upon theouter end of the spindle.

It will be seen that all the parts of the present device are selfcontained and that the grinder wheel is spaced a convenient distanceapart therefrom so encounters no obstructions to free rotation againstthe part it engages for a grinding or planing operation. The electricalmotor is started and by means of its belt drive from pulley 50 on I9 upor down of the bracket, up after being down. If it is desiredto move thetool holder horizontally of the attaching bracket, the operator takeshold of the crank handle I I 4 and turns the hand. wheel H3, to rotatescrew rod I09, and thus cause die I08 to travel horizontally upon thisscrew rod, and by its screw connection at No to the tool holder it willcause the tool holder to move along with the die. As the tool holder andits dovetail part move over the dovetail tenon 26 of the slide 24, thepulley 53 on the quill of the tool holder slides adjustably with respectto the belt 52 trained upon it and upon the pulley 50 on the motor shaft54. The electric motor is thus fixed in position and will not movehorizontally with the tool holder. The convex surface on motor shaftpulley 50 sets up ample frictional interengageriage slide I 9, as theslide 24 is swivelled with respect to the carriage.

By locking the nut I20 again, the slide 24 may adjusted position. It isthus seen that the tool holder can be placed in such positions where theworking end of the tool may best serve the purpose of doing specialmachine work. The tool does not have to be removed from its originalposition as this is effected. At all times the operator and machinist isable to consult the dial collars I00 or H5 as he turns the proper handwheel for advancing the carriage vertically or the tool holderhorizontally, and he can read the dial indications on the dial plate 25as he swivels the same about the carriage. I do not mean to confinemyself to the exact details of construction save as pointed out in theappended claim. What I desire to claim and secure by Letters Patent is:

A grinder for attachment to a lathe comprising an L-shaped member havingone side thereof horizontal and the other side thereof vertical, avertical guide carried by one face of said vertical side, a carriageengaging said guide, means for vertically adjusting said carriagerelative to said be angularly adjusted about a horizontal axis,

be rigidly held in radially a second carriage engaging said secondguide,

means adjusting said second carriage lengthwise of said second guide, amandrel journalled in said second carriage, a pulley secured to one endof said mandrel, a pair of brackets fixed to said 1 second guide andprojecting rearwar-dly of the latter, a motor pivotally secured betweensaid brackets, a holding link secured between said second guide and saidmotor, and endless-driving means between said motor and pulley, saidpulley having substantial width whereby said second carriage may belengthwise adjusted without breaking the driving connection between saidmotor and said pulley.

JOSEPH B. KOETT.

V REFERENCES c'I'rEiS The following references are of" record in thefile of this patent:

UNITED STATES PATENTS France May 12, 1920

